It was his second win at the Emirates Golf Club, in the event, which was also his first professional title back in 2009. In the five years since then, McIlroy has won four Majors and risen to World No. 1 and on present form looks unbeatable and has won his previous two Majors, too.
India's two entrants, Jeev Milkha Singh and Shiv Kapur had missed the halfway cut on Friday.
Sweden's Alex Noren, who missed almost all of 2014 with tendonitis in both wrists, carded a final round 65 to announce his return to action with a runner-up finish - his best on The European Tour since 2011.
"It's nice to be able to put my name on that trophy again," said McIlroy, who has now won four and been runner-up in three of his last seven European Tour starts.
"It felt like I was coming second every time I was teeing it up so it was time for a change and obviously the only way I wanted to go was one better and thankfully I was able to do that today.